both president obama and governor romney are seasoned debaters, and experts say neither are prone to making major gaffes. but if there is one thing that history has taught us, when it comes to presidential debates, expect the unexpected. joining us now to talk about the moments and debate magic yet to come, republican consultant romney 2008 campaign advisor, alex castellanos and donna brazile. a lot of folks are saying these debates are do or die for romney. donna, do you agree? >> absolutely. first impression is very, very important. mitt romney had several opportunities to change the trajectory of the campaign, his selection of a running mate, paul ryan, got a small bounce. the convention speech didn't get any bounce, and now the first debate. this is like the first night on broadway. there will be more voters tuning in, they will be looking at his performance and if he comes across as somebody who is credible, who is up to the task, he might get another bounce out of it. >> aren't undecided voters the least likely to tune into the debates? gallup looked back at records and found o